#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <vector>

using namespace std;

int peakIndexInMountainArray(vector<int>& arr) {
    int left = 0, right = arr.size() - 1;
    while (left < right)
    {
        int mid = left + (right - left) / 2;
        if (arr[mid] < arr[mid + 1]) left = mid + 1;
        else    right = mid;
    }

    return left;

}

int main()
{

	return 0;
}